<template>
    <div class="cmt-comtainer">
        <h3>发表评论</h3>
        <hr>
        <textarea placeholder="请输入BB的内容（最多吐槽120字）" maxlength="120" v-model="msg"></textarea>
        <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
        <div class="cmt-list">
            <div class="cmt-item">
                <div class="cmt-title">
                    第1楼&nbsp;&nbsp;用户：匿名用户&nbsp;&nbsp;发表时间：2019-04-17 10:10:30
                </div>
                <div class="cmt-body">
                    锄禾日当午，汗滴禾下土，谁知盘中餐，粒粒皆辛苦
                </div>
            </div>
            <div class="cmt-item">
                <div class="cmt-title">
                    第2楼&nbsp;&nbsp;用户：匿名用户&nbsp;&nbsp;发表时间：2019-04-17 10:10:30
                </div>
                <div class="cmt-body">
                    锄禾日当午，汗滴禾下土，谁知盘中餐，粒粒皆辛苦
                </div>
            </div>
            <div class="cmt-item">
                <div class="cmt-title">
                    第3楼&nbsp;&nbsp;用户：匿名用户&nbsp;&nbsp;发表时间：2019-04-17 10:10:30
                </div>
                <div class="cmt-body">
                    锄禾日当午，汗滴禾下土，谁知盘中餐，粒粒皆辛苦
                </div>
            </div>
            <div class="cmt-item">
                <div class="cmt-title">
                    第4楼&nbsp;&nbsp;用户：匿名用户&nbsp;&nbsp;发表时间：2019-04-17 10:10:30
                </div>
                <div class="cmt-body">
                    锄禾日当午，汗滴禾下土，谁知盘中餐，粒粒皆辛苦
                </div>
            </div>
        </div>


        <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
    </div>
</template>

<script>
import { Toast } from 'mint-ui'
export default {
    data() {
        return {
            pageIndex: 1,        // 默认展示第一页
            comments: [],
            msg: '',
        }
    },
    methods: {
        getComments(){
            this.$http.get("api/getcomments/" + this.id + "/pageIndex=" + 
            this.pageIndex).then(result => {
                if (result.body.status === 0) {
                    console.log(result.body.message)
                    // this.comments = result.body.message
                    // 每当获取新数据时，追加在后面，不要覆盖旧数据
                    this.comments = this.comments.concat(result.body.message)
                } else {
                    Toast("获取评论数据失败！")
                }
            })
        },
        getMore(){
            this.pageIndex ++
            this.getComments()
        },
        postComment(){
            // 校验数据
            if (this.msg.trim().length === 0) {
                return Toast("评论内容不允许为空!")
            }

            this.$http.post("api/postcomment/" + this.id,
            { content: this.msg.trim() }).then(result => {
                if (result.body.status === 0) {
                    // 手动拼接评论对象
                    var cmt = {
                        user_anme: "匿名用户",
                        add_time: Date.now(),
                        content: this.msg
                    }
                    this.comments.unshift(cmt)
                    this.msg = ""
                } else {
                    Toast("发表评论失败")
                }
            })
        }
    },
    created() {
        this.getComments()
    },
    props: ["id"]
    
}
</script>

<style lang="scss" scoped>
    .cmt-comtainer{
        h3{
            font-size: 18px;
        }
        textarea{
            font-size: 14px;
            height: 85px;
            margin: 0;
        }
        .cmt-list{
            margin: 5px 0;
            .cmt-item{
                font-size: 13px;
                .cmt-title{
                    line-height: 30px;
                    background-color: #ccc;
                }
                .cmt-body{
                    line-height: 35px;
                    text-indent: 2em;
                }
            }
        }
    }
</style>
